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        <p><span style="color:Chocolate;text-align:center;display:inline-block;width:100%;">闲时与你立黄昏，笑问灶前粥可温。</span></p>
<h4 id="为什么会是Spring-Boot？"><a href="#为什么会是Spring-Boot？" class="headerlink" title="为什么会是Spring Boot？"></a>为什么会是Spring Boot？</h4><p>Spring Boot本身并不提供Spring框架的核心特性以及扩展功能，只是用于快速、敏捷地开发新一代基于Spring框架的应用程序。也就是说，它并不是用来替代Spring的解决方案，而是和Spring框架紧密结合用于提升Spring开发者体验工具。</p>
<span id="more"></span>
<h4 id="常用的注解"><a href="#常用的注解" class="headerlink" title="常用的注解"></a>常用的注解</h4><ul>
<li><p>@SpringBootApplication</p>
<p>它标注在某个类上，说明这个类是SpringBoot应用的主类，SpringBoot就是启动这个类的main方法来启动SpringBoot应用。</p>
</li>
<li><p>@SpringBootConfiguration</p>
<p>它标注在类上，表示这是一个SpringBoot的配置类。替代注解@Configuration.</p>
</li>
<li><p>@EnableAutoConfiguration</p>
<p>开启自动配置功能。</p>
</li>
<li><p>@AutoConfigurationPackage</p>
<p>自动配置包注解</p>
</li>
<li><p>@ImportResource</p>
<p>将资源导入容器中</p>
</li>
<li><p>@PropertySource</p>
<p>导入properties文件</p>
</li>
<li><p>@Primary</p>
<p>自动装配时，当出现多个Bean候选者时，被注解为@Primary的Bean将作为首选者，否则将抛出异常。</p>
</li>
<li><p>@Profile</p>
<p>指定Bean在哪个环境被激活。</p>
</li>
<li><p>@DependsOn</p>
<p>依赖的Bean注册完成，才注册当前类，依赖Bean不存在会报错。</p>
<p>用于控制bean的加载顺序。</p>
</li>
<li><p>@PostConstruct</p>
<p>Bean的属性都注册完成之后，执行该注解标注的方法进行初始化工作。</p>
</li>
<li><p>@Autowired</p>
<p>默认按类型装配，如果我们想使用按名称装配，可以结合@Qualifier注解一起使用。</p>
</li>
<li><p>@Loopup</p>
<p>根据方法返回的类型，去容器中捞出对应的Bean。</p>
<p>适合单例作用域引用非单例的情况。</p>
</li>
<li><p>@Qualifier</p>
<p>声明bean的名称，且可以按bean名称加载bean。</p>
</li>
<li><p>@Required</p>
<p>检查bean的属性的<code>setXXX()</code>方法，要求属性在配置阶段必须已经配置。</p>
</li>
<li><p>@Value</p>
<p>值注入</p>
<p>@Value(“${xxx}”)注入配置文件中的值；</p>
<p>@Value(“#{xxx}”)支持spel，可注入bean、常量等</p>
</li>
<li><p>@Description</p>
<p>添加Bean的文字描述</p>
</li>
<li><p>@EnableAspectJAutoProxy</p>
<p>启动AspectJ自动代理</p>
</li>
</ul>
<blockquote>
<p>@AutoConfigurationPackage，包含该注解的package会被AutoConfigurationPackages注册<br>@AutoConfigureBefore，在指定配置类初始化前加载<br>@AutoConfigureAfter，在指定配置类初始化后加载<br>@AutoConfigureOrder，指定配置类初始化顺序，越小初始化越早</p>
<p>组件注册<br>@ComponentScans，@ComponentScan集合<br>@ComponentScan，扫描启动类目录下的所有符合条件的Bean，并注入容器<br>@Component，泛指组件，当组件不好归类的时候，我们可以使用这个注解进行标注<br>@Controller，用于标注控制层组件<br>@Repository，用于标注数据访问组件，即DAO组件<br>@Service，用于标注业务层组件<br>@Configuration，表名类里的包含@Bean注解标注的方法<br>@Bean，用在@Configuration和@Component注解下的类里面的方法上。@Configuration类里面，@Bean注解的方法被类中其他方法调用时，会注入bean而不会执行方法本身；@Component类里面，@Bean注解的方法被类中其他方法调用时，会执行方法本身，不会注入bean；被注解的方法如果是静态(static)，bean的注册时间可能比所在类的注册时间早。<br>@EnableAutoConfiguration，开启自动注册配置文件，例如会去META-INF/spring.factories找需要自动转载的类<br>@Import，将class导入容器中</p>
<p>选择器<br>@Conditional，当指定的条件都满足时，组件才被注册<br>@ConditionalOnBean，指定bean在上下文中时，才注册当前bean。用在方法上，则默认依赖类为方法的返回类型<br>@ConditionalOnClass，指定类在classpath上时，才初始化当前bean。用在方法上，则默认依赖类为方法的返回类型<br>@ConditionalOnCloudPlatform，在指定云平台才注册配置<br>@ConditionalOnExpression，指定spel为true时注册配置<br>@ConditionalOnJava，在指定java版本时注册配置<br>@ConditionalOnJndi<br>@ConditionalOnMissingBean，指定bean不在上下文中时，才初始化当前bean。用在方法上，则默认依赖类为方法的返回类型<br>@ConditionalOnMissingClass，指定类不在classpath上时，才初始化当前bean。用在方法上，则默认依赖类为方法的返回类型<br>@ConditionalOnNotWebApplication，不是在web环境才注册配置<br>@ConditionalOnProperty，配置文件中的值与指定值是否相等，相等才注册配置<br>@ConditionalOnResource，指定resources都在classpath上才注册配置<br>@ConditionalOnSingleCandidate，上下文中只有一个候选者bean时才注册配置<br>@ConditionalOnWebApplication，是在web环境才注册配置</p>
<p>缓存<br>@EnableCaching，开启缓存配置，支持子类代理或者AspectJ增强<br>@CacheConfig，在一个类下，提供公共缓存配置<br>@Cacheable，放着方法和类上，缓存方法或类下所有方法的返回值<br>@CachePut，每次先执行方法，再将结果放入缓存<br>@CacheEvict，删除缓存<br>@Caching，可以配置@Cacheable、@CachePut、@CacheEvict</p>
<p>定时器<br>@EnableScheduling，开启定时任务功能<br>@Scheduled，按指定执行周期执行方法<br>@Schedules，包含多个@Scheduled，可同时运行多个周期配置<br>@EnableAsync，开启方法异步执行的能力，通过@Async或者自定义注解找到需要异步执行的方法。通过实现AsyncConfigurer接口的getAsyncExecutor()和getAsyncUncaughtExceptionHandler()方法自定义Executor和异常处理。<br>@Async，标记方法为异步线程中执行</p>
<p>注入配置文件properties<br>@EnableConfigurationProperties，启动@ConfigurationProperties功能<br>@ConfigurationProperties，将properties文件里的内容，自动注入bean对应的属性中<br>@DeprecatedConfigurationProperty，用在配置文件的getter()方法上，标记字段已经过期，并提示替换的字段。一般给spring-boot-configuration-processor使用。<br>@NestedConfigurationProperty，标记在配置文件的字段上，提示spring-boot-configuration-processor，配置包含嵌套的配置。<br>spring-configuration-metadata.json 提供配置的元信息，在写properties配置时，会有语法提示。在项目中引入spring-boot-configuration-processor项目，会扫描@ConfigurationProperties注解，自动生成spring-configuration-metadata.json</p>
</blockquote>
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